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In Reply to: RE: No this is not an comersial product posted by Triode_Kingdom on April 04, 2017 at 06:05:02
There are lots of good pentodes to use *AS* pentodes. The lower gm and plate dissipation of the small, nominally 'signal' ones require a fairly high value plate load resistor to deliver adequate gain. When working into the grid of a power triode, it is not only the Miller of the voltage amp, and its loading from the volume pot, but the Miller-amplified capacitance of the final you'll have to worry about.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Follow Ups:
So, what you are saying is that using the 6B4G as a penthode could cause drive loss compared to use it as a triode?
Or do you mean if changed to another driver tube?
I don't think it is possible to use 6B4G as a pentode( though arranging them in Cascode is perhaps possible ). The late production 6AV5 Sylvania tubes were sold as 6B4's and I do not know where the connection of g2 to anode was made.
There are lots of small and medium-sized pentodes to use for voltage amplification. Try a small TV sweep tube...:)
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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